Heat sensitive recording papers
US4500354A · kind A · utility
4Cited by
1References
19Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 27, 1982 |
| Grant date | Feb 19, 1985 |
| Priority date | — |
| Expiry date | Sep 27, 2002 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41M5/3335
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
Water-stable phenol-amine complexes of limited water solubility for use in a thermal-sensitive paper coating containing a chromogenic compound. The complexes contain phenolic hydroxy groups and amine groups in an essentially 2:1 ratio, the amines being low boiling amines. The phenols are of the class capable of forming amine complexes having a ratio of two hydroxyl groups for each amine group. The resulting coating compositions effectively resist premature color formation during formulation, and the coated papers produced exhibit enhanced stability.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.